Used Surface Grinders Okamoto Acc 63Dx for sale (9,459)

Condition: used, total height: 1,780 mm, total length: 2,720 mm, total width: 1,910 mm, Empty weight: 2.500 kg Price: On request - Documentation available: No - CE certificate present: No Podpfx Ajwniacsmijgk - X-axis travel [mm]: 750 - Z-axis travel [mm]: 340 - Table width [mm]: 600 - Table depth [mm]: 300 - Max. grinding wheel diameter [mm]: 355 - Max. spindle speed [rpm]: 1500 - Options: Digital readout - Transport dimensions: 2725mm x 1910mm x 1780mm (l x w x h) - Transport weight [kg]: 2500kg Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: reconditioned (used), Year of construction: 2006, functionality: fully functional, feed length X-axis: 750 mm, feed length Y-axis: 340 mm, feed length Z-axis: 525 mm, workpiece weight (max.): 420 kg, grinding height: 455 mm, grinding wheel diameter: 350 mm, distance table to spindle center: 455 mm, table length: 600 mm, table load: 420 kg, type of input current: AC, table width: 300 mm, grinding wheel width: 40 mm, spindle speed (max.): 1,500 rpm, overall weight: 2,500 kg, Precision grinding machine for flat surfaces "OKAMOTO mod. ACC-63DX BV" with viewer on the grinding wheel descent axis and on the table transversal axis. Pjdpfx Amju T N Igeiegk

Condition: excellent (used), Year of construction: 2019, functionality: fully functional, Technical details grinding length 600 mm grinding width 400 mm workpiece height 400 mm weight of the machine ca. 4,5 t dimensions of the machine ca. 3592 x 3519 x 2203 mm Additional information Horizontal surface grinder in almost new condition Operating hours: CNC on: 1198 hours Podpjy Avbisfx Amiegk Machine on: 1117 hours Automatic operation: 509 hours Grinding operation: 228 hours Okamoto Touch Screen Control Travel X-axis: 600 mm Travel Y-axis: 22.5 – 497 mm Travel Z-axis: 400 mm Speed range rpm: 1-2800 (stepless) Rapid traverse mm/min: 4000 Main drive kW: 7.5 Maximum table load in kg: 1000 Accessories: - Electro-permanent magnetic clamping plate: 400 x 600 P13 mm, height 80 mm (make Wagner) - 2 grinding wheel flanges - Table dresser - Automatic straight dresser, spindle box mounted - Automatic compensation of the wheel dressing amount - Automatic central lubrication - Ball screw in the Y and Z axes with AC servo motor and measuring system - Coolant system with belt filter system

Condition: used, Year of construction: 2000, functionality: fully functional, OKAMOTO ACC 95DX Precision Surface Grinder – 400V For sale is an OKAMOTO ACC 95DX surface grinder. This is a robust industrial machine designed for precision surface grinding, making it ideal for toolmaking and manufacturing applications. The machine comes with a separate control console. Inspection and test run available by appointment. Machine Data: • Manufacturer: OKAMOTO Machine Tool Works, Ltd. • Model: ACC 95DX (Nameplate: ACC95DXM) • Serial number: 690277 • Voltage: 400 V • Phases: 3 • Frequency: 50 Hz • Total connected load: 8.6 kVA • Control/Auxiliary voltage: AC 100 V, DC 22/24 V (as per nameplate) Pgedpfxjwtm Dio Amiek Equipment / Notes: • Side-mounted control console (see photo) • Grinding head/safety enclosures included • Availability: immediate / by arrangement • Sale ex stock, subject to prior sale

Year of construction: 2001, condition: ready for operation (used), travel distance X-axis: 530 mm, travel distance Y-axis: 175 mm, overall weight: 1,250 kg, total height: 2,129 mm, spindle motor power: 1,500 W, product length (max.): 1,940 mm, table load: 120 kg, table width: 1,317 mm, number of axes: 3, This 3s OKAMOTO ACC 450 DXA was manufactured in 2001. It features a grindable surface of 450 × 150 mm and a longitudinal travel of 530 mm, making it suitable for various grinding applications. With a maximum load capacity of 120 kg on the table, this machine offers robust performance. Consider the opportunity to buy this OKAMOTO ACC 450 DXA surface grinding machine. Contact us for further details. • Grinding table • Grindable surface: 450 × 150 mm • Distance spindle–table: 60–510 mm • Max load on table: 120 kg • Wheel and spindle Pgedpfx Ajyiffgemiok • Wheel diameter: 205 mm • Wheel peripheral speed: 2,400 m/min • Spindle motor power: 1.5 kW / 2P • Motors • Hydraulic pump motor: 0.75 kW / 4P • Cross feed motor: 0.75 kW / 3P • Headstock up/down motor: 0.4 kW

Year of construction: 2018, condition: ready for operation (used), - USED - SURFACE GRINDING MACHINE MAX GRINDING LENGTH: 600 mm MAX GRINDING WIDTH: 400 mm LONGITUDINAL TRAVEL: 750 mm TRANSVERSAL TRAVEL: 340 mm 340 mm TABLE SIZE: 650 x 400 mm MAX ADMITTED LOAD: 420 Kg MAGNETIC CHUCK: 600 x 400 mm Pedoyry R Sepfx Amiogk GRINDING WHEEL SIZE: 355 x 38 x 127 mm GRINDING WHEEL SPEED: 1500 rpm MOTOR POWER: 3,7 kW WEIGHT: 2900 Kg OVERALL DIMENSIONS: 2725 x 2205 x 1761 mm ACCESSORIES: PAPER FILTER

Condition: not inspected (used), For sale is an Okamoto surface grinder type ACC-12.24DX The machine can not be tested by us, because it requires a 60 Hz connection. Visually the machine is in good condition new grinding wheel included in the offer. Technical data: Volt: 230/460 Freq.: 60 Hz phase: 3 Power: 7.5 KvA Control voltage AC: 100 V Control voltage DC: 12-24 V Clamping surface: 30*67 cm grinding wheel diameter: 30 cm Pitch circle diameter: 7.5 cm On request, for an additional charge, the machine can be loaded on truck and the transport can be organized Europe-wide. Prices plus value added tax Viewing by appointment possible. Contact us, our team is happy to help you. Trade-in or exchange possible! Machines purchase / sale PURCHASE / SALE OF PRODUCTION & METALWORKING MACHINES ETC. Do you need a high-quality but inexpensive metalworking machine for your production? Or do you want to sell yours? For more information or to contact us, please visit our website Pedonzhwwopfx Amiegk

Condition: like new (used), Year of construction: 2022, functionality: limited functionality, grinding length: 450 mm, grinding width: 150 mm, table length: 450 mm, table load: 120 kg, table width: 150 mm, grinding spindle speed: 3,000 rpm, Surface Grinding Machine from Showroom (new) Manufacturer: Okamoto Model: ACC-450 AV (open design) Year of manufacture: 2022 Control: Okamoto FX Operating hours: 0 S/N: XXXX Technical specifications: ----- • Table size: 450x150 mm • Table travel longitudinal/cross: 530x165 mm Pedpfx Amsx U Dawjisgk • Max. table load: 120 kg • Max. grinding height table / new wheel: 397.5 mm • Standard magnetic chuck: 450x150 mm (P=13mm) • Automatic infeed: 0.0001–0.030 mm • Manual micro feed: 0.0001 / 0.001 / 0.01 mm • Spark-out strokes: 0–5 • Rapid traverse: 600 mm/min • Grinding wheel: 205 x 6–19 x 31.75 mm • Speed: 3,000 rpm • Grinding spindle motor: 1.5 kW • Connected load: 7 kVA • Dimensions: 2,000 x 1,430 x 2,265 mm • Machine weight: 1,250 kg Accessories: ----- • Grinding wheel on flange (new) • Paper band filter with 160 l tank • Table dresser + diamond • Work light • Tool kit • Operating manuals

Condition: used, OKAMOTO ACC 52 DX SURFACE GRINDING MACHINE MAKE OKAMOTO, MADE IN SINGAPORE MODEL ACC 52 DX CONTROL AUTOMATIC TABLE SIZE 200 x 600 mm MAGNETIC CHUCK 200.0 x 500.0 mm ELECTRO MAGNETIC GRINDING WHEEL SIZE 205.0 x 19.0 x 50.0 mm TRAVERSES X AXIS: 650.0 mm Z AXIS: 230.0 mm DISTANCE GRINDING WHEEL TABLE 47.5 – 397.0 mm TOTAL POWER REQIUREMENT 2.25 kW MACHINE DIMENSIONS 2600 x 1600 x 1800 mm MACHINE WEIGHT 2,100 kgs PLUS DIAFORM WHEEL PROFILLING ATTACHMENT FAGOR DIGITAL READOUT VERTICAL HEIGHT READ OUT DISPLAY Podpfx Asw Elu Rjmiogk CROSS TRAVEL READ OUT DISPLAY AUTOMATIC DOWN FEED HYDRAULIC MOVEMENT COOLANT SYSTEM 200.0 x 500.0 mm FINE LOOP ELECTRO MAGNETIC CHUCK PAPER FILTRATION SYSTEM

Condition: excellent (used), Year of construction: 2018, total length: 9,800 mm, total width: 4,000 mm, feed length X-axis: 3,500 mm, feed length Y-axis: 1,100 mm, feed length Z-axis: 1,100 mm, feed rate X-axis: 30,000 m/min, feed rate Z-axis: 5,000 m/min, table length: 3,000 mm, table load: 6,000 kg, table width: 1,200 mm, power: 22 kW (29.91 HP), Surface grinder Ziersch - Z1030 MACH-ID 9597 Make: Ziersch Type: Z1030 Control: Mitsubishi Touch Year: 2018 X - Travel: 3500mm Y - Travel: 1100mm Z - Travel: 1100mm Table Length: 3000mm Table Width: 1200mm Table load: 6000 Feed rate X-Axis: 30000mm/min. Feed rate Z-Axis: 5000mm/min. Grinding stone dimensions:500 x 100 x 203mm Power: 22kW Pgedpfx Asy En Dnemijk Speeds: 3000Rpm Cooling system: yes Feed rate Y-Axis: 3000mm/min. Length: 9800mm Width: 4000mm Height: 4500mm Weight: 27500kg Please Note: The information on this page has been obtained to the best of our ability and belief, and from the manufacturers where possible. It is given in good faith, but its accuracy can not be guaranteed. Accordingly, it will not form a representation or constitute contractual terms. We advise you to check any vital details!

Condition: excellent (used), Year of construction: 2009, grinding length: 1,200 mm, grinding width: 600 mm, total length: 3,500 mm, total width: 1,875 mm, feed length X-axis: 1,320 mm, feed length Y-axis: 730 mm, feed length Z-axis: 480 mm, feed rate X-axis: 1,320 m/min, feed rate Y-axis: 730 m/min, grinding wheel diameter: 350 mm, table length: 1,200 mm, table load: 1,400 kg, table width: 700 mm, Surface grinder LGB France - R12070SM MACH-ID 9600 Make: LGB France Podpfx Ajy Edctemijgk Type: R12070SM Year: 2009 X - Travel: 1320mm Y - Travel: 730mm Z - Travel: 480mm Table Length: 1200mm Table Width: 700mm Table load: 1400 Grinding stone dimensions:350 x 50 x 127mm Power: 16kW Speeds: 1500Rpm Length: 3500mm Width: 1875mm Height: 2250mm Weight: 4500kg Please Note: The information on this page has been obtained to the best of our ability and belief, and from the manufacturers where possible. It is given in good faith, but its accuracy can not be guaranteed. Accordingly, it will not form a representation or constitute contractual terms. We advise you to check any vital details!

Condition: excellent (used), Year of construction: 2007, grinding length: 1,200 mm, grinding width: 200 mm, total height: 2,750 mm, total length: 5,200 mm, total width: 2,700 mm, feed length X-axis: 2,200 mm, feed length Y-axis: 1,240 mm, feed length Z-axis: 630 mm, table length: 2,000 mm, table load: 3,000 kg, table width: 1,200 mm, overall weight: 9,800 kg, power: 20 kW (27.19 HP), grinding wheel speed: 1,200 rpm, Surface grinder LGB France - R-12020 MACH-ID 9599 Make: LGB France Type: R-12020 Year: 2007 X - Travel: 2200mm Y - Travel: 1240mm Z - Travel: 630mm Table Length: 2000mm Table Width: 1200mm Table load: 3000 Grinding stone dimensions:450 x 80 x 127mm Power: 20kW Speeds: 1200Rpm Length: 5200mm Width: 2700mm Height: 2750mm Weight: 9800kg Psdpfoy Ec Ihex Amijgk Please Note: The information on this page has been obtained to the best of our ability and belief, and from the manufacturers where possible. It is given in good faith, but its accuracy can not be guaranteed. Accordingly, it will not form a representation or constitute contractual terms. We advise you to check any vital details!

Condition: used, Year of construction: 1999, Price: On request - Year: 1999 - Documentation available: Yes - CE marking present: Yes - CE certificate present: No - X-axis travel [mm]: 900 - Y-axis travel [mm]: 550 - Z-axis travel [mm]: 360 - Table width [mm]: 790 - Table depth [mm]: 380 - Max. grinding wheel diameter [mm]: 400 - Max. spindle speed [rpm]: 3400 Psdpfx Amewnhyhjisgk Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, Year of construction: 1998, total height: 2,500 mm, total length: 5,900 mm, total width: 3,000 mm, Empty weight: 6.700 kg Price: On request - Year: 1998 - Documentation available: Yes - CE marking present: Yes - CE certificate present: No - Serial number: 199851086/1098 - Drive system: Conventional - Power [kW]: 11.0 - X-axis travel [mm]: 1200 - Y-axis travel [mm]: 680 - Z-axis travel [mm]: 400 - Table width [mm]: 1600 - Table depth [mm]: 670 - Magnet width [mm]: 1200 - Magnet depth [mm]: 600 - Control: Conventional - Motor power: 11.0kW - Transport dimensions: 5900mm x 3000mm x 2500mm (l x w x h) - Transport weight [kg]: 6700kg Financial information VAT: The price shown is exclusive of VAT Pgedpfx Amsx E Uknjisk VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, total height: 2,000 mm, total length: 1,900 mm, total width: 1,700 mm, Empty weight: 1.500 kg Price: On request - Documentation available: No - CE certificate present: No - Serial number: 12389 - Drive system: Conventional Podpfswh Npksx Amiogk - X-axis travel [mm]: 670 - Y-axis travel [mm]: 250 - Z-axis travel [mm]: 400 - Table width [mm]: 800 - Table depth [mm]: 200 - Magnet width [mm]: 630 - Magnet depth [mm]: 200 - Max. grinding wheel diameter [mm]: 240 - Control: Conventional - Transport dimensions: 1900mm x 1700mm x 2000mm (l x w x h) - Transport weight [kg]: 1500kg - Transport packages [pcs.]: 1 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, total height: 1,980 mm, total length: 1,700 mm, total width: 1,080 mm, Colour: Green Empty weight: 1.000 kg - Documentation available: No - CE certificate present: No - Drive system: Conventional - X-axis travel [mm]: 400 - Y-axis travel [mm]: 200 - Z-axis travel [mm]: 410 - Table width [mm]: 400 - Table depth [mm]: 175 - Magnet width [mm]: 410 - Magnet depth [mm]: 170 - Max. grinding wheel diameter [mm]: 225 - Max. grinding wheel thickness [mm]: 50 Pjdpfjyvf Tasx Amisgk - Transport dimensions: 1700mm x 1080mm x 1980mm (l x w x h) - Transport weight [kg]: 1000kg - Transport packages [pcs.]: 1 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, total height: 2,100 mm, total length: 1,850 mm, total width: 1,550 mm, Empty weight: 2.300 kg - Documentation available: Yes - CE certificate present: No - Serial number: 116710373 - Power [kW]: 2.5 - X-axis travel [mm]: 450 - Y-axis travel [mm]: 250 - Z-axis travel [mm]: 280 - Table width [mm]: 750 - Table depth [mm]: 250 - Magnet width [mm]: 450 - Magnet depth [mm]: 250 - Max. grinding wheel diameter [mm]: 240 - Max. spindle speed [rpm]: 2900 - Motor power: 2.5kW - Transport dimensions: 1850mm x 1550mm x 2100mm (l x w x h) - Transport weight [kg]: 2300kg - Transport packages [pcs.]: 2 Financial information VAT: The price shown is exclusive of VAT Podpfxewya Nrj Amiegk VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, total height: 1,700 mm, total length: 2,300 mm, total width: 1,500 mm, Empty weight: 2.000 kg - Documentation available: No - CE certificate present: No - Serial number: OF50-158 - Drive system: Conventional - Power [kW]: 2.6 - X-axis travel [mm]: 500 - Y-axis travel [mm]: 200 - Z-axis travel [mm]: 400 - Table width [mm]: 720 - Table depth [mm]: 200 - Magnet width [mm]: 400 - Magnet depth [mm]: 140 - Min. spindle speed [rpm]: 1000 - Max. spindle speed [rpm]: 4000 - Options: Digital readout - └ Type of digital readout: VisoData - Control: Conventional - Motor power: 2.0kW - Transport dimensions: 2300mm x 1500mm x 1700mm (l x w x h) - Transport weight [kg]: 2000kg Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Pgjdpfxewninge Amijk Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, total height: 2,000 mm, total length: 2,600 mm, total width: 1,800 mm, Empty weight: 3.500 kg - Documentation available: Yes - CE certificate present: No - Drive system: Conventional - Power [kW]: 4.5 - X-axis travel [mm]: 600 - Y-axis travel [mm]: 350 - Z-axis travel [mm]: 510 - Table width [mm]: 800 - Table depth [mm]: 350 - Magnet width [mm]: 600 - Magnet depth [mm]: 350 - Max. grinding wheel diameter [mm]: 350 - Control: Conventional - Motor power: 4.5kW - Transport dimensions: 2600mm x 1800mm x 2000mm (l x w x h) - Transport weight [kg]: 3500kg - Transport packages [pcs.]: 1 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Pedpfjxpgwrox Amisgk Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, Year of construction: 1994, Empty weight: 2.000 kg - Year: 1994 - Documentation available: No - CE certificate present: No - Serial number: 8139 - Drive system: Conventional - Power [kW]: 7.1 - Number of axes [pcs]: 3 - X-axis travel [mm]: 600 - Y-axis travel [mm]: 350 - Z-axis travel [mm]: 600 - Table width [mm]: 1500 - Table depth [mm]: 400 - Magnet width [mm]: 600 - Magnet depth [mm]: 300 - Max. grinding wheel diameter [mm]: 300 - Max. grinding wheel thickness [mm]: 50 Pgedpfx Amsyvf Tgeiok - Main spindle power [kW]: 4.5 - Max. spindle speed [rpm]: 1750 - Transport weight [kg]: 2000kg - Transport packages [pcs.]: 2 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, total width: 2,000 mm, total length: 5,400 mm, total height: 2,200 mm, Empty weight: 10.000 kg Price: On request - Documentation available: No - CE certificate present: No - X-axis travel [mm]: 2100 - Y-axis travel [mm]: 700 Pgodpfx Aexdb Hkjmiek - Z-axis travel [mm]: 800 - Table width [mm]: 2000 - Table depth [mm]: 600 - Magnet width [mm]: 2000 - Magnet depth [mm]: 500 - Transport dimensions: 5400mm x 2000mm x 2200mm (l x w x h) - Transport weight [kg]: 10000kg - Transport packages [pcs.]: 2 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, total height: 1,620 mm, total length: 1,750 mm, total width: 1,400 mm, Empty weight: 2.500 kg - Documentation available: No - CE certificate present: No - Drive system: Conventional - Number of axes [pcs]: 3 - X-axis travel [mm]: 500 - Y-axis travel [mm]: 230 - Z-axis travel [mm]: 330 - Table width [mm]: 720 - Table depth [mm]: 200 - Magnet width [mm]: 460 - Magnet depth [mm]: 180 Pgodpfoyh Amlsx Amisk - Options: External cooling - Transport dimensions: 1750mm x 1400mm x 1620mm (l x w x h) - Transport weight [kg]: 2500kg - Transport packages [pcs.]: 1 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, total height: 2,150 mm, total length: 3,200 mm, total width: 1,900 mm, Empty weight: 3.500 kg - Documentation available: No - CE certificate present: No - Serial number: 179997 - Drive system: Conventional - Power [kW]: 4.0 - X-axis travel [mm]: 1000 - Y-axis travel [mm]: 350 - Z-axis travel [mm]: 500 - Table width [mm]: 1100 - Table depth [mm]: 350 - Magnet width [mm]: 1000 - Magnet depth [mm]: 300 - Max. grinding wheel diameter [mm]: 300 - Control: Conventional - Motor power: 4.0kW - Transport dimensions: 3200mm x 1900mm x 2150mm (l x w x h) - Transport weight [kg]: 3500kg Pjdsx A Tudjpfx Amiogk - Transport packages [pcs.]: 1 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, total height: 2,650 mm, total length: 4,700 mm, total width: 2,100 mm, Empty weight: 5.500 kg Price: On request - Documentation available: No - CE certificate present: No - Drive system: Conventional - X-axis travel [mm]: 1500 - Y-axis travel [mm]: 800 - Z-axis travel [mm]: 700 - Table width [mm]: 1200 - Table depth [mm]: 400 - Magnet width [mm]: 1200 - Magnet depth [mm]: 300 - Options: Digital readout - └ Type of digital readout: Heidenhain - Control: Conventional - Transport dimensions: 4700mm x 2100mm x 2650mm (l x w x h) - Transport weight [kg]: 5500kg - Transport packages [pcs.]: 1 Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Pgsdpfx Ajx Dkggjmijk Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum

Condition: used, Year of construction: 1998, Empty weight: 21.000 kg Price: On request - Year: 1998 - Documentation available: Yes - CE marking present: Yes - CE certificate present: No - Serial number: 430290898 - Drive system: CNC - Control system brand: Unicon - Power [kW]: 60.0 - X-axis travel [mm]: 1500 - Y-axis travel [mm]: 900 - Z-axis travel [mm]: 550 - Table width [mm]: 2000 - Table depth [mm]: 900 - Magnet width [mm]: 1500 - Magnet depth [mm]: 800 - Max. spindle speed [rpm]: 3000 - Options: Filter system - Control type: Unicon - Control: CNC - Motor power: 60.0kW - Transport weight [kg]: 21000kg Pedpfx Asx E Ukusmiegk Financial information VAT: The price shown is exclusive of VAT VAT/margin: VAT deductible for entrepreneurs Delivery and trade-in always possible for everything in the industrial sectors Lukas van Rossum